Top answers

describe the electrostatic force between water molecules

a type of wander waals force called hydrogen bonding due to the slightly positive hydrogens and slightly negative oxygen. this occurs because of the uneven attraction for electrons between the oxygen and hyd...
MS
Answered by Murray S. • Chemistry tutor
3246 Views

How does fractional distillation separate different hydrocarbons in crude oil?

Crude oil is a mixture of different hydrocarbons, which all have different lengths and must be separated by length into different useful 'fractions'. Fractional distillation achieves this by using the fact t...
SJ
Answered by Samuel J. • Chemistry tutor
17870 Views

If cells can respire anaerobically, why do humans need oxygen?

Cells can indeed respire - or release energy - without oxygen, using anaerobic respiration. Here, energy is released from glucose to generate a substance called lactic acid. This is a good temporary solution...
SJ
Answered by Samuel J. • Biology tutor
26581 Views

Describe the primary and secondary effects of an earthquake.

One common primary (or immediate) effect of an earthquake is the destruction of buildings. The collapse of buildings could in turn lead to the loss of life. Earthquakes may also cause damage to vital infrast...
SW
Answered by Sam W. • Geography tutor
28716 Views

What is a sustainable city?

Sustainability is the ability to meet the needs of the present without impacting of the needs of the future. A sustainable city should consider three key areas; economics, social, and environment. The city s...
RI
Answered by Rebecca I. • Geography tutor
4841 Views